NEPOMUC的全反射高能正电子衍射仪--仪器、模拟和首次测量
Total-Reflection High-Energy Positron Diffractometer at NEPOMUC -- Instrumentation, Simulation and First Measurements
摘要：
我们报告了一个新的正电子衍射仪，连接到高强度正电子源NEPOMUC的仪器。介绍了正电子束自适应的关键因素，包括磁场终端、用于亮度增强的可选传输型再调制器、用于加速的静电系统和束流光学。为了优化系统，即获得小直径的相干束流，模拟了再减速束流和二次再减速束流的正电子轨迹。在第一个beamtime内，我们调整了系统并表征了直接光束。对于能量为10 keV的二次再减速束流，实验观察到束流直径d < 1.3mm，与模拟结果吻合较好。
英文摘要：
We report the instrumentation of a new positron diffractometer that is connected to the high-intensity positron source NEPOMUC. Crucial elements for the adaption of the positron beam are presented, which include the magnetic field termination, the optional transmission-type remoderator for brightness enhancement and the electrostatic system for acceleration and beam optics. The positron trajectories of the remoderated and the twofold remoderated beam have been simulated to optimize the system, i.e. to obtain a coherent beam of small diameter. Within a first beamtime we tuned the system and characterized the direct beam. For the twofold remoderated beam of 10keV energy, we experimentally observe a beam diameter of d < 1.3mm, which agrees well with the simulation.
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